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B727 Flight Controls - High Lift Devices

HIGH LIFT DEVICES Combining both leading and trailing edge devices provides high lift capability in the 727. The trailing edge flaps are triple slotted Fowler flaps and are divided into two sets, inboards and outboards. Each set is bussed separately by torque tubes. The flap handle on the control stand normally controls flaps. Flap positions are: UP 2, 5, 15, 20, 25, 30, and 40 with gates at the 2 and 25 positions. Though operational reasons sometimes prevents these all being used (certain stage three requirements). The position 2 gate prevents inadvertent retraction of the flaps prior to reaching air speed requirements and also acts as a reminder to check the leading edge annunciator before selecting another position. The position 25 gate establishes the lower end of the takeoff range. This gate also facilitates locating the go-around position without visual reference to the flap handle. Both gates require that the lever be lowered into the detent and passed under the gate before it can be moved further.